+

US20080081624A1 - Inter-network handover optimization for terminals using advanced receivers - Google Patents

Inter-network handover optimization for terminals using advanced receivers Download PDF

Info

Publication number
US20080081624A1
US20080081624A1 US11/537,104 US53710406A US2008081624A1 US 20080081624 A1 US20080081624 A1 US 20080081624A1 US 53710406 A US53710406 A US 53710406A US 2008081624 A1 US2008081624 A1 US 2008081624A1
Authority
US
United States
Prior art keywords
network
receiver
sir
event
events
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/537,104
Other languages
English (en)
Inventor
Andres Reial
Bengt Lindoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US11/537,104 priority Critical patent/US20080081624A1/en
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REIAL, ANDRES, LINDOFF, BENGT
Priority to TW096129727A priority patent/TW200818940A/zh
Priority to ES07788538T priority patent/ES2351587T3/es
Priority to MX2009002663A priority patent/MX2009002663A/es
Priority to JP2009529638A priority patent/JP5087626B2/ja
Priority to EP07788538A priority patent/EP2067370B1/fr
Priority to AT07788538T priority patent/ATE479294T1/de
Priority to KR1020097005900A priority patent/KR20090057398A/ko
Priority to PCT/EP2007/058856 priority patent/WO2008037552A1/fr
Priority to DE602007008741T priority patent/DE602007008741D1/de
Priority to CN2007800358081A priority patent/CN101518128B/zh
Publication of US20080081624A1 publication Critical patent/US20080081624A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709727—GRAKE type RAKE receivers

Definitions

  • the present invention relates to cellular telecommunication networks. More particularly, and not by way of limitation, the present invention is directed to a system and method for inter-network handover (HO) optimization for terminals or user equipment (UE) using advanced receivers.
  • HO inter-network handover
  • UE user equipment
  • a typical cellular mobile communication network (network) consists of many cells, each of which allows a terminal or UE to maintain a connection with the network over a limited geographical area.
  • the UE moves around in the region covered by the network, at each time moment, it is connected via a radio link to the cell that can provide the connection with “least cost”, where the cost is often related to the signal power needed to transmit over the radio link.
  • the serving cell is the cell physically closest to the UE.
  • the network will perform a HO procedure to transfer the UE's connection from one cell to another.
  • the UE can maintain a connection simultaneously over several cells, using several radio links in parallel. This is referred to as SHO.
  • the original network may arrange for an alternative way to continue the connection by seamlessly switching over to another network that can provide coverage at the location. This may be accomplished using (1) another network belonging to the same operator, or (2) a network belonging to another operator, in which case the UE “roams” over to the other operator.
  • An example of case (1) is an operator that operates both WCDMA and GSM networks, and switches a WCDMA user over to GSM when the WCDMA coverage becomes weak. This is referred to as an IRAT HO, since the access technology is changed in the HO process.
  • An impending loss of connection in one RAT is not the only reason why an operator may choose to force an IRAT HO. It may also be done if re-distribution of users between the different RATs improves the total capacity of the networks.
  • case (2) is the operator that only owns a WCDMA network, and, in the case of deficient coverage, directs the UEs to roam to another operator's network with whom they have an agreement. This is a cost-efficient way for a new operator to launch their network without requiring 100% coverage from the first day of operation. However, the original operator loses the revenue from the calls after they have roamed to another network.
  • a HO to another network is triggered if the useful signal strength, measured by the UE, drops below a certain threshold.
  • This threshold may be continuously signaled by the network to the UE.
  • the network dynamically adjusts the threshold value based on the expected BLER or throughput performance as a function of SIR at the UE, using the knowledge of the current network loading and assuming a standard receiver in the UE.
  • the standard receiver is a single-antenna RAKE receiver.
  • the WCDMA RRM procedures are generally known by practitioners in the art, as is the IRAT HO sequence.
  • the UE receiver performance in terms of the experienced BLER, throughput, or the average transmit power expended by the network may be significantly improved by applying more advanced receiver structures.
  • a WCDMA UE using dual receiver antenna chains and/or applying interference suppression has been shown to provide considerable improvements in the experienced BLER, throughput, or the average transmit power expended by the network. This means that the performance is improved while the UE is in the standard coverage area of the WCDMA network. But in addition to that, advanced UE receivers would allow the coverage area itself to be extended, because the performance limiting (or in more extreme cases, connection-terminating) signal level thresholds are lower and they would be encountered further away from the center of the cell.
  • a primary disadvantage of the existing HO management solutions is that the decision to perform the HO to another network is based on comparing the measured signal strength with a fixed threshold that does not account for the actual improved UE performance.
  • the UEs with advanced receivers are reverted away from the network unnecessarily, which wastes network resources, limits the revenue of the operator, and possibly degrades the user experience.
  • each HO procedure implies an additional cost to the operator in terms of signaling resources used and potential UE performance degradation due to performing measurements in parallel (e.g. the compressed mode in WCDMA).
  • That disclosure describes adjusting Ec/Io to better reflect the HSDPA performance, by taking the PDP as well as an estimate of the cell load into account.
  • the concept is basically only suitable for HSDPA inter-frequency handover, and therefore is not adapted to facilitate IRAT/inter-network HO using advanced receivers as disclosed herein.
  • the present invention is a system and method adapted to adjust threshold values for initiating HO measurements based on actual UE performance.
  • the threshold values for initiating the HO measurements and for executing the HO are determined by the network.
  • the thresholds Prior to determining whether to proceed with these procedures, the thresholds are adjusted, based on the actual UE performance. This adjustment is achieved by applying an offset in dB that captures the effective SIR improvement of the advanced receiver compared to the standard receiver used to set the thresholds.
  • the offset depends on, among other things, the receiver type used, the number of receiver antennas, the multi-path channel profile, the number of active radio links, and the services/connection modes that are currently active in the UE.
  • FIG. 1 is an graph comparing the HO process with example threshold values using the CPICH RSCP as a HO criterion
  • FIG. 2 is a block diagram for a UE according to a first embodiment of the present invention
  • FIG. 3 is a flow chart of the method of the first embodiment of the present invention.
  • FIG. 4 illustrates the sequence of operations in the second embodiment of the present invention
  • the standard receiver structure has been a single-antenna RAKE receiver that is able to efficiently collect and utilize signal energy available from a fading multi-path propagation channel. This is achieved by assigning each multi-path component a despreader whose reference copy of the spreading code is delayed equally to the path delay of the corresponding multipath component. The outputs of the despreaders (fingers) are then coherently combined to produce a symbol estimate.
  • the RAKE receiver requires knowledge of the multipath delays and the values of the channel impulse response for all paths.
  • RAKE receiver A good measure of performance of the RAKE receiver is the SNR after combining, which is maximized if the signal energy from all paths is utilized.
  • An implicit assumption in RAKE combining is that the impairment (noise and interference) components of the signals seen by each finger are uncorrelated, in which case the RAKE receiver is an optimal linear receiver.
  • the single-antenna RAKE receiver performance is limited by a number of factors.
  • One performance-limiting aspect is the fading characteristics of the channel, especially on channels with few multipath components.
  • One such advanced receiver type is a dual-antenna receiver, where the signal is received via two separate antennas, RF and front end processing branches. If the two branches are sufficiently separated (electrically and spatially), the dual-antenna RAKE receiver (RAKE 2 ) will then exhibit improved performance, due to the array gain (more signal energy is received) and the diversity gain (the probability of deep fades is reduced). As a result, the BLER performance of the receiver is improved.
  • Another advanced receiver type incorporates equalization (e.g., LMMSE CE, GRAKE).
  • equalization e.g., LMMSE CE, GRAKE.
  • the RAKE 2 and GRAKE receivers may also be combined, and the resulting structure (GRAKE 2 ) yields a receiver that combines the diversity and interference suppression in an optimal way, further improving performance.
  • GRAKE 2 is the optimal linear receiver for WCDMA.
  • the receiver performance may be improved further by applying non-linear operations, e.g. interference cancellation by subtracting the known interfering signal components before detecting the data symbols of interest.
  • ASIR average combined SIR improvement
  • the HO process from WCDMA to GSM is considered.
  • the WCDMA CPICH RSCP and SNR for each cell in the active set is constantly monitored by the UE.
  • the measurement is updated every 70 ms and may be reported to the network.
  • the network maintains thresholds for when the different HO-related activities should be initiated.
  • the reported values are then compared to the relevant thresholds and, if the measurements indicate that the received signal levels at the UE are becoming too weak, a decision is taken to initiate IRAT measurements.
  • the decision may be taken by the UE or the network, in which case this may be communicated to the UE via a RRC-level “Measurement Control” message.
  • “event 2d” is triggered and the UE would commence to measure the GSM RSSI (RXLEV) for the closest GSM cell.
  • the UE In order to perform measurements on another frequency, the UE enters CM, whereby all the information from the BS is transmitted during a shorter time interval and some percentage (e.g. 50%) of the time may be used by the UE to re-tune to another frequency and carry out the measurements. These results are then also reported to the network in a “Measurement report” message.
  • CM the signal quality improves sufficiently so that no loss of connection is imminent (“event 2f”), or (b) the alternative network is deemed to have better signal quality than the present one (“event 3a”) and a HO is performed.
  • the HO process with example threshold values is depicted in graph 100 of FIG. 1 , using the CPICH RSCP as a HO criterion.
  • the network broadcasts and the UE has knowledge of the thresholds used for defining the HO-related events.
  • the latest UE measurement at time t is denoted as ⁇ (t) and the threshold for event e is denoted as ⁇ (e) (All SIR values are given in dB.)
  • the UE checks whether the condition(s) for any of the events of interest, e ⁇ E, are fulfilled:
  • F( ) is a set of criteria for triggering the events according to the specifications.
  • An ex-ample of one such instruction could be the event 2 d:
  • the UE sends a message signaling that event to the network.
  • the network may then respond with further instructions to the UE in order to, for example, initiate additional measurements, perform a HO, and the like.
  • the threshold values ⁇ (e) are typically based on the RAKE receiver performance.
  • the UE will account for the improved receiver performance by introducing a correction term in the decision process identifying whether any events in E are triggered:
  • D may be determined by defining the current receiver and channel category c(t) and performing a table lookup to find the corresponding average SIR gain
  • two instantaneous SIR values may be computed: the current effective receiver SIR, SIR(t) (which is usually done as part of normal receiver operation) and an additional RAKE receiver SIR SIR RAKE (t), being a low complexity operation, once the channel estimates and combining weights are available.
  • the correction term is then determined as
  • FIG. 2 A block diagram of a UE according to a first embodiment of the present invention is illustrated in FIG. 2 .
  • the latest UE measurement ⁇ (t) is received at block L 3 decision processor 201 , which also receives ⁇ (e) from the network.
  • the UE measurement ⁇ (t) is supplied from a base band processor 206 , or more precisely from a path searcher 205 which is part thereof. In other implementations, ⁇ (t) could be supplied from some other baseband processing stage.
  • L 3 decision processor 201 checks whether the condition(s) for any of the events of interest, e ⁇ E , are fulfilled as noted above. If event e is established, the UE sends a message via modulator 202 and front end transmitter 203 signaling that event to the network. The network may then respond with further instructions to the UE in order to, for example, initiate additional measurements, perform a HO, and the like.
  • the control unit 204 will account for the improved receiver performance by introducing a correction term in the decision process of L 3 decision processor 201 identifying whether any events in E are triggered.
  • D as communicated to L 3 decision processor may be determined by defining the current receiver and channel category c(t) and performing a table lookup to find the corresponding average SIR gain, as noted above in equation 3.
  • the UE of FIG. 2 in particular the L 3 decision processor, operates according to the sequence of operations seen in the flow chart 300 of FIG. 3 .
  • the flow chart of FIG. 3 checks for all events of interest in E.
  • the process starts in step 301 .
  • the UE receives thresholds used for defining the HO-related events from the network.
  • the threshold for event e is denoted as ⁇ (e).
  • the measurement at time t denoted as ⁇ (t)
  • D is determined as described above.
  • the first event of interest is set.
  • the UE checks whether the condition(s) for any of the events of interest, e ⁇ E, are fulfilled according to
  • step 307 if event e is established, the UE sends a message signaling that event to the network.
  • the network may then respond in step 308 with further instructions to the UE in order to, for example, initiate additional measurements, perform a HO, and the like. If further events are to be checked, the next event is set at step 309 , which is then checked at step 306 .
  • the process ends at step 310 .
  • the threshold values ⁇ (e) are not broadcast and the UE has no knowledge of the current threshold values.
  • the UE will send the UE measurement results ⁇ (t) to the network, which then evaluates the relevant conditions for events in E.
  • the decision process expressed in equation (1) takes place in the network, instead of the UE.
  • the UE accounts for the improved receiver performance by modifying the RSCP value appropriately before reporting it. That is, instead of reporting the actual value of ⁇ (t), it reports
  • the correction term D is determined as in equation (3) or equation (4).
  • the block diagram for a UE implementing the second embodiment of the present invention is similar to that seen in FIG. 2 .
  • the main difference is that instead of performing the L 3 decision process in the UE and sending an event flag to the network, the offset D is applied to the measurement ⁇ (t) and the adjusted measurement is sent it to the network.
  • FIG. 4 illustrates the sequence of operations in the second embodiment of the present invention.
  • several RABs or services are in progress in the UE simultaneously, which may experience different effective SIR improvement impact due to the advanced receiver.
  • the smallest SIR improvement should be selected as the correction term D. This guarantees that needs of the most sensitive service are accounted for, and avoids undue signal level reduction for any of the services.
  • the flow chart 400 starts at step 401 .
  • the measurement at time t denoted as ⁇ (t)
  • D is determined as described above.
  • the process ends.
  • the RSCP may be used as ⁇ (t), the HO criterion in the disclosed herein.
  • the procedure may alternatively be carried out by using the CPICH Ec/Io measure as the criterion.
  • the adjustment of the alternative threshold(s) would follow the same principles.
  • the network will obtain the following benefits: the loss of revenue for the original operator due to roaming to another operator's network is reduced; the available network capacity (i.e. operator's hardware investment) is more fully utilized; and less network resources are used for HO signaling.
  • the innovative concepts described in the present application can be modified and varied over a wide range of applications.
  • the present invention has been described in terms of a HO from WCDMA to GSM.
  • the invention is not limited to that context.
  • the described threshold adjustment method may be applied also to HOs between other technologies, between two networks using the same technology, and even to inter-frequency handovers within the same network.
  • the present invention can be implemented wherever it is advantageous to avoid unnecessarily initiating a measurement and HO process that may drain network signaling resources and/or capacity. Accordingly, the scope of patented subject matter should not be limited to any of the specific exemplary teachings discussed above, but is instead defined by the following claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US11/537,104 2006-09-29 2006-09-29 Inter-network handover optimization for terminals using advanced receivers Abandoned US20080081624A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US11/537,104 US20080081624A1 (en) 2006-09-29 2006-09-29 Inter-network handover optimization for terminals using advanced receivers
TW096129727A TW200818940A (en) 2006-09-29 2007-08-10 Inter-network handover optimization for terminals using advanced receivers
CN2007800358081A CN101518128B (zh) 2006-09-29 2007-08-27 对使用先进接收机的终端进行网络间切换优化
JP2009529638A JP5087626B2 (ja) 2006-09-29 2007-08-27 アドバンスドレシーバを使用する端末のためのネットワーク間ハンドオーバの最適化
MX2009002663A MX2009002663A (es) 2006-09-29 2007-08-27 Optimizacion de conmutacion de redes internas para terminales que usan receptores avanzados.
ES07788538T ES2351587T3 (es) 2006-09-29 2007-08-27 Optimización de transferencias entre redes para terminales que utilizan receptores avanzados.
EP07788538A EP2067370B1 (fr) 2006-09-29 2007-08-27 Optimisation de transferts inter-réseaux pour terminaux utilisant des récepteurs évolués
AT07788538T ATE479294T1 (de) 2006-09-29 2007-08-27 Optimierung des handovers zwischen netzen für erweiterte empfänger benutzende endgeräte
KR1020097005900A KR20090057398A (ko) 2006-09-29 2007-08-27 개량형 수신기를 이용한 터미널의 인터네트워크 핸드오버 최적화 방법
PCT/EP2007/058856 WO2008037552A1 (fr) 2006-09-29 2007-08-27 Optimisation de transferts inter-réseaux pour terminaux utilisant des récepteurs évolués
DE602007008741T DE602007008741D1 (de) 2006-09-29 2007-08-27 Optimierung des handovers zwischen netzen für erweiterte empfänger benutzende endgeräte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/537,104 US20080081624A1 (en) 2006-09-29 2006-09-29 Inter-network handover optimization for terminals using advanced receivers

Publications (1)

Publication Number Publication Date
US20080081624A1 true US20080081624A1 (en) 2008-04-03

Family

ID=37808337

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/537,104 Abandoned US20080081624A1 (en) 2006-09-29 2006-09-29 Inter-network handover optimization for terminals using advanced receivers

Country Status (11)

Country Link
US (1) US20080081624A1 (fr)
EP (1) EP2067370B1 (fr)
JP (1) JP5087626B2 (fr)
KR (1) KR20090057398A (fr)
CN (1) CN101518128B (fr)
AT (1) ATE479294T1 (fr)
DE (1) DE602007008741D1 (fr)
ES (1) ES2351587T3 (fr)
MX (1) MX2009002663A (fr)
TW (1) TW200818940A (fr)
WO (1) WO2008037552A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090089699A1 (en) * 2007-10-01 2009-04-02 Ebay Inc. Method and system for intelligent feature degradation in response to a network deficiency detection
US20110176430A1 (en) * 2010-01-20 2011-07-21 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for triggering measurements of other radio access technologies (rats)
US20110201357A1 (en) * 2010-02-12 2011-08-18 David Garrett Method and system for refining a location of a base station and/or a mobile device based on signal strength measurements and corresponding transmitter and/or receiver antenna patterns
CN102572983A (zh) * 2010-12-14 2012-07-11 中国移动通信集团设计院有限公司 一种移动终端进行网络切换的方法、系统及装置
CN102893659A (zh) * 2010-05-19 2013-01-23 华为技术有限公司 通过自适应切换阈值的多频段切换
WO2014056142A1 (fr) * 2012-10-09 2014-04-17 Telefonaktiebolaget L M Ericsson (Publ) Procédé et dispositif d'étalonnage d'une fonction d'optimisation de robustesse des mobiles
WO2014085196A1 (fr) * 2012-11-27 2014-06-05 Qualcomm Incorporated Mesure de la technologie d'accès inter radio (irat) afin d'améliorer les performances de la batterie d'un équipement utilisateur (ue)
WO2014113366A1 (fr) * 2013-01-15 2014-07-24 Blackberry Limited Procédé et appareil d'amélioration de la mobilité
US20140341117A1 (en) * 2009-05-22 2014-11-20 Verizon Patent And Licensing Inc. User equipment attachment/detachment from a long term evolution (lte) network
US9226215B2 (en) 2013-07-03 2015-12-29 Qualcomm Incorporated Inter radio access technology (IRAT) threshold adjustment

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100056157A1 (en) * 2008-08-26 2010-03-04 Motorola, Inc. Method and Apparatus for Making Handover Decisions in a Heterogeneous Network
EP2343923A1 (fr) * 2010-01-12 2011-07-13 ST-Ericsson (France) SAS Gestion de la mesure de la qualité pour un transfert d'appel inter-RAT dans un dispositif de télécommunication mobile
WO2011092636A1 (fr) * 2010-01-26 2011-08-04 Nokia Corporation Report de mesure de cellules inter-rat de plus d'un rat dans un réseau geran
JP5185969B2 (ja) 2010-04-02 2013-04-17 株式会社エヌ・ティ・ティ・ドコモ 移動通信システムにおける移動機及び方法
CN102026144A (zh) * 2010-11-05 2011-04-20 北京星网锐捷网络技术有限公司 漫游性能测试方法、设备及系统
WO2013010565A1 (fr) * 2011-07-15 2013-01-24 Nokia Siemens Networks Oy Élément de réseau et procédé de fonctionnement associé
EP2810472B1 (fr) * 2012-02-03 2017-01-11 Telefonaktiebolaget LM Ericsson (publ) Noeud et procédé permettant d'adapter des mesures parallèles par rapport à un récepteur amélioré
EP2688338B1 (fr) * 2012-07-17 2015-01-28 Alcatel Lucent Procédés, appareils et programmes informatiques pour un émetteur/récepteur mobile et un émetteur/récepteur de station de base
US9485692B2 (en) * 2014-08-29 2016-11-01 Qualcomm Incorporated LTE handover parameter configuration for specific types of traffic
US9743324B2 (en) 2015-09-02 2017-08-22 Apple Inc. Cell reselection for link budget limited devices
SG11201806526RA (en) 2016-02-08 2018-08-30 Ericsson Telefon Ab L M Methods for quality-aware reporting of rssi-based measurements to avoid rssi window split

Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422933A (en) * 1993-09-09 1995-06-06 Hughes Aircraft Compnay Method and system for effecting handoff in a cellular communication system
US5557657A (en) * 1993-09-09 1996-09-17 Hughes Aircraft Company Handoff between overlay and underlay cells
US5722073A (en) * 1996-02-21 1998-02-24 Telefonaktiebolaget L M Ericsson Method and system for measuring signals in a telecommunications systemhaving maho
US6292519B1 (en) * 1998-03-11 2001-09-18 Telefonaktiebolaget Lm Ericsson (Publ) Correction of signal-to-interference ratio measurements
US6363104B1 (en) * 1998-10-02 2002-03-26 Ericsson Inc. Method and apparatus for interference cancellation in a rake receiver
US20020049058A1 (en) * 2000-10-23 2002-04-25 Tee Lai King Enhancement of soft handoff in a mobile wireless network through the use of dynamic information feedback from mobile users
US20020102977A1 (en) * 1999-05-18 2002-08-01 Hong Shi Adaptive threshold of handoff in mobile telecommunication systems
US20030016641A1 (en) * 2001-05-14 2003-01-23 Terry Stephen E. Channel quality measurements for downlink resource allocation
US6529482B1 (en) * 1999-06-30 2003-03-04 Qualcomm Inc. Method and apparatus for adjusting a signal-to-interference threshold in a closed loop power control communications system
US6625132B1 (en) * 1997-11-13 2003-09-23 Nortel Networks Ltd Idle intersystem roaming determination and system reselection in a CDMA wireless communication system
US20030190924A1 (en) * 2002-04-05 2003-10-09 Agashe Parag A. Method and apparatus for determining receive diversity in mobile station
US20030218995A1 (en) * 2002-05-21 2003-11-27 Samsung Electronics Co., Ltd. Method for handling inter-RAT measurement and report in a dual-mode user equipment
US20030224813A1 (en) * 2002-05-09 2003-12-04 Nokia Corporation Multiple level power control command signaling
US20040022228A1 (en) * 2002-07-30 2004-02-05 Interdigital Technology Corporation Power measurement of received CDMA signals using soft threshold preprocessing after correlation
US6745034B2 (en) * 2000-12-22 2004-06-01 Nokia Corporation Apparatus, and associated method, for adaptively selecting a handoff threshold in a radio communication system
US6763234B1 (en) * 1999-07-28 2004-07-13 Nec Corporation Method of controlling intersystem hand-off by subtracting margin value from pilot signal strength of other system
US20040147264A1 (en) * 2003-01-29 2004-07-29 Evolium S.A.S. Handover control method of performing handover control of wireless mobile device, base station control apparatus, and wireless mobile device
US20050181731A1 (en) * 2004-02-17 2005-08-18 Ziad Asghar Automatic threshold selection method for improving the detection of a wireless signal
US20050201499A1 (en) * 2004-03-12 2005-09-15 Elias Jonsson Method and apparatus for received signal quality estimation
US20050201447A1 (en) * 2004-03-12 2005-09-15 Cairns Douglas A. Method and apparatus for parameter estimation in a generalized rake receiver
US20060109820A1 (en) * 2004-11-25 2006-05-25 Casio Hitachi Mobile Communications Co. Handoff control method and mobile station
US20070047630A1 (en) * 2005-08-24 2007-03-01 Oki Electric Industry Co., Ltd. Synchronous control apparatus for initial synchronization when receiving a wireless signal
US7321645B2 (en) * 2003-08-29 2008-01-22 Lucent Technologies Inc. Method and arrangement for detecting a random access channel preamble using multiple antenna reception in a communication system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000092540A (ja) * 1998-09-16 2000-03-31 Toshiba Corp 移動無線通信システム、移動無線端末装置、および移動速度検出方法
JP4199139B2 (ja) * 2004-02-18 2008-12-17 日本電信電話株式会社 無線通信装置およびシステム間ハンドオーバ制御方法

Patent Citations (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557657A (en) * 1993-09-09 1996-09-17 Hughes Aircraft Company Handoff between overlay and underlay cells
US5422933A (en) * 1993-09-09 1995-06-06 Hughes Aircraft Compnay Method and system for effecting handoff in a cellular communication system
US5722073A (en) * 1996-02-21 1998-02-24 Telefonaktiebolaget L M Ericsson Method and system for measuring signals in a telecommunications systemhaving maho
US6625132B1 (en) * 1997-11-13 2003-09-23 Nortel Networks Ltd Idle intersystem roaming determination and system reselection in a CDMA wireless communication system
US6292519B1 (en) * 1998-03-11 2001-09-18 Telefonaktiebolaget Lm Ericsson (Publ) Correction of signal-to-interference ratio measurements
US6363104B1 (en) * 1998-10-02 2002-03-26 Ericsson Inc. Method and apparatus for interference cancellation in a rake receiver
US20020102977A1 (en) * 1999-05-18 2002-08-01 Hong Shi Adaptive threshold of handoff in mobile telecommunication systems
US6507740B2 (en) * 1999-05-18 2003-01-14 Ericsson Inc. Adaptive threshold of handoff in mobile telecommunication systems
US6529482B1 (en) * 1999-06-30 2003-03-04 Qualcomm Inc. Method and apparatus for adjusting a signal-to-interference threshold in a closed loop power control communications system
US6763234B1 (en) * 1999-07-28 2004-07-13 Nec Corporation Method of controlling intersystem hand-off by subtracting margin value from pilot signal strength of other system
US20020049058A1 (en) * 2000-10-23 2002-04-25 Tee Lai King Enhancement of soft handoff in a mobile wireless network through the use of dynamic information feedback from mobile users
US6745034B2 (en) * 2000-12-22 2004-06-01 Nokia Corporation Apparatus, and associated method, for adaptively selecting a handoff threshold in a radio communication system
US20030016641A1 (en) * 2001-05-14 2003-01-23 Terry Stephen E. Channel quality measurements for downlink resource allocation
US20030190924A1 (en) * 2002-04-05 2003-10-09 Agashe Parag A. Method and apparatus for determining receive diversity in mobile station
US20030224813A1 (en) * 2002-05-09 2003-12-04 Nokia Corporation Multiple level power control command signaling
US20030218995A1 (en) * 2002-05-21 2003-11-27 Samsung Electronics Co., Ltd. Method for handling inter-RAT measurement and report in a dual-mode user equipment
US20040022228A1 (en) * 2002-07-30 2004-02-05 Interdigital Technology Corporation Power measurement of received CDMA signals using soft threshold preprocessing after correlation
US20040147264A1 (en) * 2003-01-29 2004-07-29 Evolium S.A.S. Handover control method of performing handover control of wireless mobile device, base station control apparatus, and wireless mobile device
US7321645B2 (en) * 2003-08-29 2008-01-22 Lucent Technologies Inc. Method and arrangement for detecting a random access channel preamble using multiple antenna reception in a communication system
US20050181731A1 (en) * 2004-02-17 2005-08-18 Ziad Asghar Automatic threshold selection method for improving the detection of a wireless signal
US20050201499A1 (en) * 2004-03-12 2005-09-15 Elias Jonsson Method and apparatus for received signal quality estimation
US20050201447A1 (en) * 2004-03-12 2005-09-15 Cairns Douglas A. Method and apparatus for parameter estimation in a generalized rake receiver
US20060109820A1 (en) * 2004-11-25 2006-05-25 Casio Hitachi Mobile Communications Co. Handoff control method and mobile station
US20070047630A1 (en) * 2005-08-24 2007-03-01 Oki Electric Industry Co., Ltd. Synchronous control apparatus for initial synchronization when receiving a wireless signal

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8015280B2 (en) * 2007-10-01 2011-09-06 Ebay Inc. Method and system for intelligent feature degradation in response to a network deficiency detection
US20090089699A1 (en) * 2007-10-01 2009-04-02 Ebay Inc. Method and system for intelligent feature degradation in response to a network deficiency detection
US20140341117A1 (en) * 2009-05-22 2014-11-20 Verizon Patent And Licensing Inc. User equipment attachment/detachment from a long term evolution (lte) network
US10383044B2 (en) * 2009-05-22 2019-08-13 Verizon Patent And Licensing Inc. User equipment attachment/detachment from a long term evolution (LTE) network
US20110176430A1 (en) * 2010-01-20 2011-07-21 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for triggering measurements of other radio access technologies (rats)
US8238920B2 (en) 2010-01-20 2012-08-07 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for triggering measurements of other radio access technologies (RATS)
US20110201357A1 (en) * 2010-02-12 2011-08-18 David Garrett Method and system for refining a location of a base station and/or a mobile device based on signal strength measurements and corresponding transmitter and/or receiver antenna patterns
CN102893659A (zh) * 2010-05-19 2013-01-23 华为技术有限公司 通过自适应切换阈值的多频段切换
EP2572532A4 (fr) * 2010-05-19 2013-05-22 Huawei Tech Co Ltd Transfert intercellulaire multibande via un seuil de transfert intercellulaire adaptatif
CN102893659B (zh) * 2010-05-19 2015-06-03 华为技术有限公司 通过自适应切换阈值的多频段切换
CN102572983A (zh) * 2010-12-14 2012-07-11 中国移动通信集团设计院有限公司 一种移动终端进行网络切换的方法、系统及装置
US9723525B2 (en) 2012-10-09 2017-08-01 Telefonaktiebolaget L M Ericsson Method and device for calibrating mobile robustness optimization function
WO2014056142A1 (fr) * 2012-10-09 2014-04-17 Telefonaktiebolaget L M Ericsson (Publ) Procédé et dispositif d'étalonnage d'une fonction d'optimisation de robustesse des mobiles
WO2014085196A1 (fr) * 2012-11-27 2014-06-05 Qualcomm Incorporated Mesure de la technologie d'accès inter radio (irat) afin d'améliorer les performances de la batterie d'un équipement utilisateur (ue)
CN104813717A (zh) * 2012-11-27 2015-07-29 高通股份有限公司 用于改进用户装备(ue)电池性能的无线电接入技术间(irat)测量
US9198098B2 (en) 2012-11-27 2015-11-24 Qualcomm Incorporated Inter radio access technology (IRAT) measurement to improve user equipment (UE) battery performance
WO2014113366A1 (fr) * 2013-01-15 2014-07-24 Blackberry Limited Procédé et appareil d'amélioration de la mobilité
US9226215B2 (en) 2013-07-03 2015-12-29 Qualcomm Incorporated Inter radio access technology (IRAT) threshold adjustment

Also Published As

Publication number Publication date
EP2067370A1 (fr) 2009-06-10
MX2009002663A (es) 2009-03-24
CN101518128A (zh) 2009-08-26
TW200818940A (en) 2008-04-16
CN101518128B (zh) 2012-05-09
ES2351587T3 (es) 2011-02-08
WO2008037552A1 (fr) 2008-04-03
DE602007008741D1 (de) 2010-10-07
JP5087626B2 (ja) 2012-12-05
JP2010505312A (ja) 2010-02-18
EP2067370B1 (fr) 2010-08-25
ATE479294T1 (de) 2010-09-15
KR20090057398A (ko) 2009-06-05

Similar Documents

Publication Publication Date Title
EP2067370B1 (fr) Optimisation de transferts inter-réseaux pour terminaux utilisant des récepteurs évolués
CN101843142B (zh) 触发时间处理方法和设备
US6845238B1 (en) Inter-frequency measurement and handover for wireless communications
EP1204219B1 (fr) Appareil et procédé pour la commande d'un réseau d'antennes d'emission pour un canal descendant partagé physique dans un système de communications mobiles
EP2321994B1 (fr) Procédure de transfert basée sur la qualité entre cellules co-localisées
EP1159841B1 (fr) Algorithmes de transfert adaptatif pour mobiles fonctionnant dans des systemes amrc
JP3795400B2 (ja) 無線システムにおける電力制御
CN102204329B (zh) 用于支持电信系统中的移动性触发的多种设定的方法和布置
JP4557762B2 (ja) 移動局の通信環境測定方法及び移動局
US8660086B2 (en) Method and apparatus for admission control and forced handover in a multi-layer network configuration
KR20160019102A (ko) 다수의 안테나들을 이용하는 시분할 멀티플렉싱(tdd) 디바이스들에 의한 송신을 위한 방법 및 장치
EP1142408A1 (fr) Systeme et procedes pour l'estimation des mesures interfrequences utilisees pour la fonction de reseau radio
US8135407B2 (en) Network evaluated hard hardover using predictions
KR20150084907A (ko) 향상된 모빌리티 관리의 장치 및 방법들
EP1377101B1 (fr) Méthode et unité de commande pour la mise à jour d'un ensemble actif d'un terminal d'abonné dans un système radio cellulaire
US20110105166A1 (en) Method and Arrangement in a Telecommunication System
CN103139859A (zh) 蜂窝无线电网络的无线电接收器装置
Mohammed et al. 2G/3G inter-RAT handover performance analysis
Lugara et al. UMTS to GSM handover based on compressed mode technique
KR20040063957A (ko) 셀룰러 네트워크에 다운링크 접속을 제공하기 위한 방법및 시스템
KR100708502B1 (ko) 무선 네트워크 기능으로 사용된 중간 주파수 측정값을추정하는 시스템 및 방법
Takenaka et al. Development of cdma2000 RTT-based experimental system for IMT-2000
Soy Performance analysis of uplink throughput with changing active set size in cellular radio systems
Grewal QoS parameters analysis of UMTS handoffs using OPNETTM 14.5

Legal Events

Date Code Title Description
AS Assignment

Owner name: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:REIAL, ANDRES;LINDOFF, BENGT;REEL/FRAME:018698/0023;SIGNING DATES FROM 20061003 TO 20061004

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载